Electrosurgical generators and sensors
AssigneeCovidien LP
InventorsDean C. Buck, Edward L. Brannan, Mark A. Johnston
Life of this patent
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Abstract
An electrosurgical generator includes a radio frequency output stage, a sensor for sensing current, and an active lead. The radio frequency output stage is configured to output at least one radio frequency waveform. The sensor includes a current sensor coil including an outer coil including an opening therethrough and an inner coil coupled to and disposed within the outer coil. The active lead is coupled to the radio frequency output stage and passes through the current sensor coil opening. The current sensor coil is configured to output a first signal indicative of a current within the active lead.
Claims17
An electrosurgical generator, comprising:
- a radio frequency output stage configured to output at least one radio frequency waveform;
- a sensor for sensing current, the sensor including:
- a current sensor coil including:
- an outer coil including an opening therethrough;
- a pair of first and second terminals coupled to the outer coil at a first end of the current sensor coil;
- and
- an inner coil coupled to and disposed within the outer coil;
- and
- at least one active lead coupled to the radio frequency output stage and passing through the opening of the outer coil, wherein the current sensor coil is configured to output a signal indicative of a current within the at least one active lead, the at least one active lead including:
- a top portion extending parallel with and over a top surface of the current sensor coil at a first non-zero acute angle relative to an axis that extends through the first end of the current sensor coil and a center of the opening of the current sensor coil;
- and
- a bottom portion extending parallel with and over a bottom surface of the current sensor coil at a second non-zero acute angle relative to the axis, the first and second angles being symmetrical relative to each other about the axis.
An electrosurgical generator, comprising:
- a radio frequency output stage configured to output at least one radio frequency waveform;
- a sensor for sensing current, the sensor including:
- a current sensor coil defining an opening therethrough and diametrically opposed first and second ends, the current sensor coil including:
- an outer coil including a first semi-circular portion and a second semi-circular portion;
- and
- an inner coil disposed within the outer coil and including a first semi-circular portion and a second semi-circular portion, wherein the first semi-circular portions and the second semi-circular portions of the inner and outer coils are separated at the second end;
- and
- at least one active lead and at least one return lead coupled to the radio frequency output stage and passing through the current sensor coil, wherein the current sensor coil is configured to output a differential signal indicative of a current within the at least one active lead and at least one return lead, the at least one active lead including:
- a top portion extending along a plane defined by a top surface of the first semi-circular portion of the outer coil at a first non-zero acute angle relative to an axis that extends through the first end of the current sensor coil and a center of the opening of the current sensor coil;
- and
- a bottom portion extending along a plane defined by a bottom surface of the second semi-circular portion of the outer coil at a second non-zero acute angle relative to the axis, the first and second angles being symmetrical relative to each other about the axis.
Dependencies are inferred from the claim text.